Add ES2015 destructuring sample

destructuring-es6/README.md

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+Destructuring (ES2015) Sample
+==================================
+See https://googlechrome.github.io/samples/destructuring-es6/index.html for a live demo.
+
+Learn more at https://www.chromestatus.com/feature/4588790303686656

destructuring-es6/demo.js

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+// ES2015 destructuring assignment lets you extract data from arrays or objects
+// using a syntax similar to the construction of array and object literals
+var cats = ['😹', '🙀', '😻'];
+var catAges = {sam: 12, passy: 14, surma: 16};
+
+// Access the first three items of an array in ES5
+var one = cats[0];
+var two = cats[1];
+var three = cats[2];
+ChromeSamples.log(one, two, three);
+
+// Destructure the array in ES2015
+var [a, b, c] = cats;
+ChromeSamples.log(a, b, c);
+
+// Destructure an array omitting certain values
+var [x, , y] = cats;
+ChromeSamples.log(x, y);
+
+// Destructure an array using the ES2015 rest operator
+var [kitty, ...otherKitties] = cats;
+ChromeSamples.log(kitty, otherKitties);
+
+// Destructure an object
+var {passy, surma} = catAges;
+ChromeSamples.log(passy, surma);
+
+// Destructure an object, binding variables to different properties
+var {sam: cat1, passy: cat2, surma: cat3} = catAges;
+ChromeSamples.log(cat1, cat2, cat3);
+
+// Default values for function object parameters
+var request = ({
+  url: url = 'github.com', crossDomain: crossDomain = true},
+  ...data) => {
+  ChromeSamples.log(`url: ${url}, crossDomain: ${crossDomain}, data: ${data}`);
+};
+
+request({url: 'thecatapi.com'}, 'cute', 'kittens');

destructuring-es6/index.html

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+---
+feature_name: Destructuring (ES2015)
+chrome_version: 49
+feature_id: 4588790303686656
+---
+
+<h3>Background</h3>
+<p><a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment'>Destructuring assignment</a> allows extracting data from arrays or objects using a syntax that mirrors array and object literals.</p>
+
+<p>The object and array literal expressions provide an easy way to create ad hoc packages of data. Once you've created these packages of data, you can use them any way you want to. You can even return them from functions.</p>
+
+{% include output_helper.html %}
+
+{% include js_snippet.html filename='demo.js' %}